Abstract

In the method, switching in request response message is sent to user station after switching in request message is correctly received, unique connection identification CID corresponding to this time of switching in request and disposed by system is attached with switching in request response message, time of restart to launch switching in request is confirmed by utilizing backspace algorithm calculation in corresponding backspace domain according to switching in type if switching request is launched on selected public switching in channel after at least two backspace domain division informations of at least one public switching in channel is correctly received by user station.

Description

本发明涉及无线通信系统，特别涉及在公共接入信道中提供接入网络服务的方法。 The present invention relates to wireless communication systems, particularly to a method of providing access to a network service in the public access channel.

背景技术 Background technique

在无线通信系统中，将允许在多个用户站和系统之间进行信息交换。 In a wireless communication system, to allow the exchange of information between subscriber stations and a plurality of systems.为支持多个用户站能随机接入系统，通信系统将提供一个或多个反向(从用户站到基站)公共接入信道；当某个用户站试图接入系统时，将在选取的反向公共接入信道中发起接入请求；基站通过检测反向公共接入信道，可以获取终端的接入请求信息。 To support a plurality of subscriber stations randomly access system, the communication system provides one or more of the reverse direction (from a subscriber station to a base station) a common access channel; When a subscriber station attempts to access the system, the selected anti an access request to a common access channel; the base station by detecting a reverse common access channel, the access terminal may acquire the requested information.

在无线通信系统中，由于反向公共接入信道向用户站提供的是共享介质的接入环境，需采用适当的随机接入方法，以减少或避免用户站的接入请求之间的冲突。 In a wireless communication system, since the reverse common access channel is provided to the user station shared media access environment, it requires the use of an appropriate random access method in order to reduce or avoid collision between access requests subscriber station.按照在发送分组前是否检测信道，将随机接入方法分为两类，一类是发送分组前无需检测信道，典型的如ALOHA和时隙ALOHA等。 Detecting channel according to whether a packet prior to transmission, the random access method is divided into two, one is not necessary to detect packet before transmission channel, such as the typical like ALOHA and slotted ALOHA.因为在发送分组前未能检测信道中是否有其它用户站的接入请求，所以ALOHA机制不能避免用户站的接入请求之间的冲突。 Because the failed packet before sending an access channel to detect whether other user station request, the ALOHA mechanism can not avoid collisions between access requests subscriber station.在ALOHA机制中，当用户站判决接入请求遭遇冲突时，将等待一定的回退时间后重新发起接入请求，回退时间将通过回退算法计算得到。 Reinitiate access request in the ALOHA scheme, a subscriber station when the access request judgment subject to conflicts, the backoff time to wait for a certain backoff time obtained by calculating a backoff algorithm.ALOHA机制设计简单，所需系统控制信息较少，但这种方法不能避免用户站的接入请求之间的冲突。 ALOHA mechanism is simple design, less control information is required for the system, but this method can not avoid collision between access requests subscriber station.ALOHA机制一般适用于业务量较少的系统环境。 ALOHA mechanism is generally applicable to low traffic system environment.另一类是在发送分组前要求检测信道，典型的如载波侦听多重复用协议族(CSMA)等。 Another requirement is detection before packet transmission channel, typically used as a carrier sense multiple duplicate protocol family (CSMA) and the like.相对于ALOHA机制，CSMA协议族要求在发送分组前检测信道，因而CSMA协议族比ALOHA能更大地避免碰撞，可提供更大的业务量；但这要求系统提供信道检测等控制规程，增加了设计方法的复杂性。 With respect to the ALOHA mechanism, CSMA protocol suite required before sending the packet detects that the channel, so CSMA protocol suite than ALOHA can be greater to avoid a collision, may provide greater traffic; however, this requires the system to provide control protocol channel detection, increases the design the complexity of the method.

作为通信网络中一种成熟的随机接入协议，ALOHA协议最初是由夏威夷大学的一些研究员设计用于将多个无线分组终端互连。 As a mature communications network random access protocol, ALOHA protocol was originally designed by a number of researchers at the University of Hawaii for interconnecting a plurality of wireless packet terminals.ALOHA和其演进的协议，如时隙ALOHA协议的优点是设计简单，所需系统控制信息较少，适合于业务量较少的系统环境。 And its evolution ALOHA protocol, slotted ALOHA protocol such as the advantages of a simple design, it requires less traffic control system less information system environment suitable for.

ALOHA协议已被广泛应用于无线通信系统。 ALOHA protocol has been widely used in wireless communication systems.如工作于2-11GHz频段的无线宽带接入系统IEEE802.16a，IEEE802.16a规范设计的主要目的是支持固定用户的宽带接入。 The IEEE802.16a wireless broadband access systems operating in the 2-11GHz band, the main purpose is to support IEEE802.16a standard design fixed broadband user access.在IEEE802.16a规范中，支持三种工作模式：单载波，正交频分复用(OFDM)和正交频分多址(OFDMA)等。 In IEEE802.16a specification, supports three operating modes: single carrier, Orthogonal Frequency Division Multiplexing (OFDM) and orthogonal frequency division multiple access (OFDMA) and the like.在单载波和OFDM模式下，用户站将在反向接入信道中，利用媒质接入(MAC)层接入请求消息发起接入请求；而在OFDMA工作模式下，用户站将借助于伪随机码信息完成接入请求。 In the single-carrier and OFDM mode, the user station on the reverse access channel, using a media access (MAC) layer access requests an access request message; whereas in OFDMA mode, the subscriber station by means of a pseudorandom code information to complete the access request.

在IEEE802.16a规范中，当用户站需要接入网络时，用户站将执行IEEE802.16a规范中的网络登录规程。 In IEEE802.16a specification, when a user needs to access the network station, the subscriber station performs a network entry procedure IEEE802.16a specification.IEEE802.16a规范中的的网络登录规程需要用户站和基站之间相互协作，共同完成。 Network entry procedure IEEE802.16a specification is required between the base station and the subscriber stations cooperate with each other, work together.IEEE802.16a规范中的网络登录规程包括：用户站完成与基站的同步，并从前向(基站到用户站)控制信道中，获得有关前向和反向(用户站到基站)信道分配的有关信息；用户站和网络协作完成初始接入过程；用户站和网络协商服务能力，以得到系统服务能力等信息；用户站的认证和注册步骤；建立会话连接和其它操作等。 Network entry procedure IEEE802.16a specification comprising: a user station to complete the synchronization of the base station, and from the forward (base station to subscriber station) control channels to obtain the relevant front and reverse (subscriber station to the base station) channel assignment information ; user stations and network collaboratively initial access procedure; user stations and network capability negotiation service, to obtain information system service capacity; authentication and registration step of the subscriber station; to establish a session connection and other operations.其中在网络登录规程中的初始接入过程中，提供类似ALOHA的机制用于用户站的随机接入，当用户站判决接入请求因发生冲突未被基站正确接收时，将在相同的回退域中，采用回退算法计算并回退一段时间后重新发起接入请求。 Wherein the initial access procedure of network entry process by providing a similar mechanism for ALOHA random access subscriber station, a subscriber station when the judgment result of the access request conflict with the base station is not received correctly, the same backoff domain, using an access request again after a backoff algorithm and calculate the backoff period.其中，回退域的分配信息将由系统在公共控制信道中定期通告给用户站。 Among them, the fallback domains are assigned by the system information in a common control channel regularly advertised to the user station.从统计角度，这种回退域的分配和回退算法的设计目标是为了支持所有用户能公平接入系统。 From a statistical point of view, the design goal of distribution and back-off algorithm that fallback domain is to support fair access for all users to the system.

IEEE802.16e是IEEE802.16a的扩展模式，IEEE802.16e的设计目标是基于IEEE802.16a规范，在支持用户的固定接入的基础上，扩展IEEE802.16a以支持用户的移动性。 A IEEE802.16a IEEE802.16e is extended mode, the design goal is based on IEEE802.16e IEEE802.16a specification, supports the user on the basis of the fixed access, IEEE802.16a extended to support user mobility.在多小区移动通信系统中，用户的移动性不可避免地带来了切换问题，即移动用户在跨越多小区时如何维持会话连接的问题，这种问题可利用硬切换方法来完成。 In the multi-cell mobile communication system, mobility of the user inevitably bring the handover problem, i.e. the problem how to maintain the mobile user connection during a session across multiple cells, such problems can be accomplished using a hard handoff method.在硬切换过程中，移动用户站(以下称移动站)会先中断与原基站的连接，再在一定时间内与选定的新基站建立联系，从而接入到网络系统并得到系统的服务。 In hard handover, the mobile subscriber station (hereinafter referred to as a mobile station) will terminate the connection to the original base station, and then connect with the selected new base station within a certain time, so that access to the network system and the system to obtain service.

在IEEE802.16e中，硬切换过程可以由移动站向选定的新基站发起接入请求来实现。 In IEEE802.16e, the hard handover procedure may be implemented to initiate an access request to the new base station selected by the mobile station.为与IEEE802.16a兼容，这种网络接入过程可基于IEEE802.16a的网络登录过程来完成：通过搜索前向控制信道，移动站完成与基站的同步并获得有关前向和反向信道分配的信息；移动站和选定的新基站之间协作完成移动站的接入；执行移动站的部分认证和注册步骤；重新建立会话连接和其它操作等。 For compatibility with IEEE802.16a, such network access procedure may be done based on the IEEE802.16a network entry procedure: For complete the synchronization and obtain the forward and reverse channel assignment to the control channel with the base station, the mobile station searches through the front of information; done in collaboration between the mobile station and the new base station access a selected mobile station; performing partial authentication and registration step of the mobile station; re-establish a session connection and other operations.

与用户站初始接入相比，切换发生时所需的网络接入过程具有以下不同点：切换的目标是完成会话的持续，一般要求移动站的接入服务能在较短的时间内完成；而用户站初始接入的目标是使得用户站初次接入网络，因此，切换下移动站的可容忍的最大接入时间将远小于用户站的初始接入所能容忍的最大接入时间。 Compared to the initial user access stations, required for a handover occurs with a network access procedure in the following points: target handover complete the session is continued, typically requires access to the service the mobile station can be completed in a shorter period of time; and the target initial access subscriber stations such that a user station is first access network, and therefore, the mobile station switches the maximum access time will be much less than the tolerable maximum access time of initial access of the subscriber station can be tolerated.也即对比一般用户站的初始接入请求，切换需要更快的网络接入。 Comparative i.e. an initial access request of a subscriber station in general, the need for faster network access switch.而在IEEE802.16a中，从对用户站接入请求提供的服务来看，其设计目标是支持用户能公平地接入系统，即提供给所有接入用户相同的接入性能。 In IEEE802.16a, the service from the user station requests access to the view, the user can be designed to support equitable access system providing access for all users to access the same performance.因而若在公共接入(子)信道中，利用现有的IEEE802.16a的接入服务方法将造成切换和其他接入类型的接入请求之间大量的冲突，从而增加切换下的接入时间，不易满足切换所需的快速接入的要求。 Thus, if the public access (sub) channels, using conventional IEEE802.16a access service method will cause a lot of conflict between access requests and other access types of handover, so as to increase the access time of the handover , not easy to meet the requirements needed to switch fast access.为了利用IEEE802.16a的网络登录规程，完成包括支持切换所需的快速接入等的多种接入服务需求，一种可行的方案是系统为切换下的接入请求提供专用的接入(子)信道，但这样将浪费带宽等网络资源。 In order to utilize the network entry protocol IEEE802.16a, it needs to complete a variety of services including access needed to support the quick access switch, etc. A possible solution is to access the next switching system to provide a dedicated access (subrequests ) channel, but this will waste network bandwidth resources.

切换发生时所需的网络登录规程还具有以下不同点：切换发生前，移动站已经建立了与原基站的连接，也就是说移动站已经得到了包括系统时间信息，系统的有关服务能力等系统信息。 When a handover occurs also required network entry procedure with the following differences: before the handover occurs, the mobile station has established a connection with the original base station, i.e. the mobile station has received information comprises a system time, system service capacity related systems information.为了提高切换的效率，切换发生时所需的网络登录规程中可以忽略或者跳过在IEEE802.16a中定义的网络登录规程。 To improve the efficiency of the handover, handover occurs when the required network entry procedure may be omitted or skipped in the network entry protocol defined in IEEE802.16a.为了便于系统能针对切换简化某些网络接入步骤，提供切换所需的快速接入服务，有必要提供便于系统识别出切换发生时的接入请求信息的方法。 To facilitate the switching system can be simplified for certain network access procedure, to provide the desired quick access service is switched, it is necessary to provide a method that facilitates identifying access system switching occurs when request information.

发明内容 SUMMARY

本发明的目的是提供一种在利用公共接入(子)信道完成接入请求服务的系统中，支持多级接入服务，以及标识切换下的网络接入请求的方法。 Object of the present invention is to provide a channel is created using the public access (sub) system service access request, the multi-level access, and a method of network access request under the identity switch.这些方法可以方便地运用于IEEE802.16e规范中，以提供利用公共接入(子)信道满足切换所需的快速网络接入的要求。 These methods can be easily applied to IEEE802.16e specification, to provide the requested using the public access (sub) channel satisfy the required fast switching network access.

为实现上述目的，一种在公共接入信道中提供多级接入服务的方法，包括步骤：无线网络系统中的基站定期或按需在前向公共控制信道中向该基站对应的小区通告以下信息：(a)公共接入(子)信道的分配信息，以及(b)在至少一个公共接入(子)信道的至少两个回退域的划分信息；在正确接收到用户站的接入请求消息，并确认能向该用户站提供对应的接入服务后，将向用户站发送接入请求响应消息，接入请求响应消息将携带系统分配给与该次接入请求对应的唯一的连接标识CID；无线网络系统中的用户站在正确接收到服务小区内通告的涉及公共接入(子)信道分配，和在至少一个公共接入(子)信道的至少两个回退域的划分信息后，若在选定的公共接入(子)信道发起接入请求，将(a)按照接入类型选择对应的回退域，并且(b)在对应的回退域中，利用回退算法计算以确 To achieve the above object, a method for providing multilevel access services in a common access channel, comprising the steps of: a base station of a wireless network system demand or periodically to the base station corresponding to the forward common control channel in the cell advertised information: (a) access public (sub) channel assignment information, and (b) at least one of the at least two split information common access backoff domains (sub) channel in; correctly received in the access to the subscriber station request message, and confirms the service can provide access to the corresponding user station, the subscriber station will send an access request response message, the access request response message carries the unique connection system assigned to the access times corresponding to the request the CID identifier; wireless network system is directed to the subscriber station correctly received public access (sub) channel allocation services advertised within the cell, and dividing at least one common access information (sub) channel of the at least two backoff domains after, if the channel access request in the selected common access (a), the (a) according to the corresponding access type selected backoff domain, and (b) a corresponding backoff domain, using the backoff algorithm calculating to ensure定重新发起接入请求的时间。 Given time reinitiate access request.

基于ALOHA或时隙ALOHA接入机制，提出了利用公共接入的(子)信道支持多种接入服务的方法，系统定期或按需向用户通告公共接入(子)信道和对应各个接入(子)信道的多个回退域的分配信息；用户站为避免接入请求遭遇到冲突，可按照接入类型选择回退域，并从对应回退域中计算并确定重新发起接入请求的时间。 ALOHA or slotted ALOHA-based access mechanism, a method (sub) channel to support multiple access using a common access service, the system periodically or on-demand access to the public access each advertisement (sub) channel corresponding to the user a plurality of backoff domain assignment information (sub) channel; subscriber station in order to avoid conflicts encountered an access request, may be selected backoff domain according to an access type, and calculating from a corresponding backoff domain, and re-determine the access request time.这种方法可以提供至少两级接入服务，减少不同接入类型的接入请求的冲突，而且对比向不同接入类型的接入请求提供不同的公共接入(子)信道的方法，可以节省带宽等网络资源。 This approach may provide at least two services access, reducing collisions of different types of access requests an access, but also provide different common access comparison (sub) channel access request to access different types of methods can save bandwidth network resources.对于利用公共接入(子)信道完成多种接入请求服务的系统，提出了标识切换下的网络接入请求的方法。 For public access using the (sub) channel more complete the system access request and services, a method at a network access identifier of the handover request.当用户站向基站发起接入请求消息，切换下的网络接入请求消息可以利用专用的接入请求消息，或在原有的接入请求消息RNG-REQ中加入标识切换请求类型的字段，或借助于专用的伪随机码信息等方式实现。 When the subscriber station to initiate an access request message to a base station, the access network may handover request message using a dedicated access request message, or the original access request message RNG-REQ adding handover type identifier of the requested field, or by implemented on a dedicated pseudo-random code information or the like.采用这些方法，可在提供用户站接入服务的同时，便于系统识别硬切换下的网络接入请求，从而简化处理切换所需的网络登录规程，提供硬切换所需的快速接入的服务要求。 Using these methods, while providing the user station can access service, the network access request to facilitate identification system hard handoff, thereby simplifying the processing required to switch the network entry procedures, provide service requires hard handover required rapid access .以IEEE802.16e规范中的OFDMA模式为实施例，进一步说明了利用伪随机码标识切换用接入请求的方法：IEEE802.16e的OFDMA模式下的搜索码的生成式将输出长码，标识用的伪随机码将通过截取该输出长码而产生。 In IEEE802.16e specification mode is OFDMA embodiments, further illustrate the method of pseudo-random identification code switching access requests: search codes in an OFDMA mode of formula IEEE802.16e outputs long code identified by the the pseudo-random code generated by long code intercepts the output.这种伪随机码的生成方式易于与IEEE802.16a规范兼容，并便于系统设计；提出的标识硬切换的伪随机码的分配方法将易于系统识别用户的硬切换下的接入请求类型。 This pseudo-random code generation method readily compatible with IEEE802.16a standard, and facilitate the system design; pseudorandom code assignment method proposed identification hard handover will readily access the hard handoff system recognizes the user's request type.

附图说明 BRIEF DESCRIPTION

图1是前向和反向信道示意图；图2a是TDD模式下的帧控制信息和信道映射示意图1；图2b是TDD模式下的帧控制信息和信道映射示意图2；图3a是FDD模式下的帧控制信息和信道映射示意图1；图3b是FDD模式下的帧控制信息和信道映射示意图2；图4.1是提供多个回退域的上行接入信道映射(UL-RACH-MAP)格式1；图4.2是提供多个回退域的上行接入信道映射(UL-RACH-MAP)格式2；图5是切换用接入请求消息RNG-REQ-HO的格式；图6a是包含硬切换发生时的接入搜索过程；图6b是OFDMA模式下包含硬切换发生时的接入搜索过程；图7是用户站的接入请求流程图。 Figure 1 is a schematic view of the forward and reverse channels; FIG. 2a is a frame in a TDD mode control information and the channel map in Scheme 1; Figure 2b is a frame in a TDD mode control information and the channel mapping Scheme 2; FIG. 3a is an FDD mode, frame control information and the channel map in Scheme 1; Figure 3b is a frame in the FDD mode control information and the channel mapping Scheme 2; FIG. 4.1 is to provide a plurality of backoff domains uplink access channel map (UL-RACH-mAP) format 1; Figure 4.2 is to provide a plurality of backoff domains uplink access channel mapping channel (UL-RACH-mAP) format 2; FIG. 5 is a handover message RNG-REQ-HO access request with a format; FIG. 6a is a hard handover occurs comprising access search process; FIG. 6b comprising an access search process occurs when OFDMA hard handover mode; FIG. 7 is a flowchart of an access request of the subscriber station.

具体实施方式 Detailed ways

本发明提出了在利用公共接入(子)信道完成接入请求服务的系统中，支持多级接入服务，以及标识切换下的网络接入请求的方法。 The present invention proposes a channel is created using the public access (sub) system service access request, the multi-level access, and a method of network access identifier of the handover request.这些方法可以方便地运用于IEEE802.16e规范中，以提供利用公共接入(子)信道满足切换所需的快速网络接入的要求。 These methods can be easily applied to IEEE802.16e specification, to provide the requested using the public access (sub) channel satisfy the required fast switching network access.

1.信道划分和接入(子)信道中的参数信息1.1前向和反向信道的分配在无线通信系统中，如IEEE802.16a规范定义的宽带无线接入系统中，用户站和基站之间的交互信息将在多个逻辑信道中进行传输。 Between the forward and reverse channel assignment in a wireless communication system, such as the IEEE802.16a specification defines a broadband wireless access system, a subscriber station and a base station prior to channel 1. 1.1 parameter information and the access division (sub) channels the interactive information will be transmitted in a plurality of logical channels.从数据信息的传输方向来分，这些逻辑信道可分为从基站到用户站的前向信道和从用户站到基站的反向信道。 The transmission direction of data points, these logical channels can be divided into the front from the base station to the user station from the user channel and the reverse channel to the base station.如图1所示，基站11和用户站12之间的前向信道包括了前向导频信道(F-PCH)，前向公共控制信道(F-CCH)和前向业务信道(F-TrCH)等。 1, the front 12 between the base station and the subscriber station 11 includes a forward pilot channel (F-PCH), forward common control channel (F-CCH), and the forward traffic channel (F-TrCH) to the channel Wait.其中前向导频信道(F-PCH)用于用户站12和基站11之间的同步；前向公共控制信道(F-CCH)用于基站11向用户站12传递网络参数和公共控制信息，公共控制信息可包括反向和前向信道的信道分配信息等；前向业务信道(F-TrCH)用于基站11向用户站12传递前向业务信息。 Wherein the forward pilot channel (F-PCH) for synchronizing subscriber stations and the base station 12 among 11; 11 for the front base information to the subscriber station 12 is transmitted to the common control network parameters and common control channel (F-CCH), the common the control information may comprise a channel and a reverse channel prior to assignment information; 12 for the front before transmitting station to the base station 11 to the user service information to the traffic channel (F-TrCH).基站11和用户站12之间的反向信道包括了反向接入信道(R-ACH)和反向业务信道(R-TrCH)等。 Reverse channel 11 between a base station and the subscriber station 12 includes a reverse access channel (R-ACH) and a reverse traffic channel (R-TrCH) and the like.其中反向接入信道(R-ACH)用于用户站的接入服务；反向业务信道(R-TrCH)用于用户站向基站传递反向业务信息。 Wherein the reverse access channel (R-ACH) services for user access stations; Reverse Traffic Channel (R-TrCH) reverse traffic transmission for the subscriber station to the base station.

在无线环境下，当用户站试图接入系统时，用户站首先需要完成与基站的下行(从基站到用户站)同步，这可通过捕获和追踪前向导频信道(F-PCH)的信息来完成。 In a wireless environment, when a subscriber station attempts to access the system, the subscriber station first need to complete downlink with the base station (from the base station to the subscriber station) synchronization, which may be pilot information channel (F-PCH) of the front capture and tracking to carry out.用户站还需要从前向公共控制信道获得网络参数和公共控制信息，公共控制信息包括了反向和前向信道的信道分配以及各个信道的有关参数信息等。 The subscriber station also needs to obtain network parameters and the previous common control information to the common control channel, the common control information includes information about the parameters of the reverse and forward channel assignment channel to the respective channels, and the like.利用这些信息，用户站可在选定的反向接入信道(R-ACH)中发起接入请求。 With this information, the subscriber station may initiate an access request in a selected reverse access channel (R-ACH) in.从时间域上看，前向传输信号和反向传输信号将以帧的格式进行传输。 Viewed in the time domain, the signal format before transmission, and transmit a signal to reverse the frame will be transmitted.图2a和图2b所示为时分双工(TDD)模式下帧控制信息和信道映射示意图。 The frame control information and channel map schematic time division duplex (TDD) mode as shown in Figures 2a and 2b.在TDD模式下，帧控制信息22由基站11在F-CCH信道中向用户站12发送，其中帧控制信息22包括了反向信道的映射信息(UL-MAP)和前向信道(DL-MAP)的映射信息。 In the TDD mode, frame control information 2211 sent by the base station F-CCH channel to the subscriber station 12, wherein the frame control information 22 includes mapping information of a reverse channel (UL-MAP) and a forward channel (DL-MAP ) mapping information.其中，DL-MAP信息反映了同一帧中的前向子帧24在前向信道的分配情况，如图2a和图2b所示。 Wherein, DL-MAP information reflects the distribution of frames 24 in the same frame before the sub-channels forward, as shown in Figures 2a and 2b.UL-MAP信息将反映反向子帧26在反向信道的分配情况。 UL-MAP information 26 to reflect the reverse subframe allocation in the reverse channel.从基站发出UL-MAP信息，到用户站识别反向子帧26在反向信道的分配信息需经历一段时间，为便于系统处理，这段时间至少应该大于基站和用户站之间信号的最大传输时延的两倍。 UL-MAP information sent from a base station to the subscriber station identification subframe counter 26 in the reverse channel allocation information needs to undergo a period of time, the system for ease of processing, this time should be at least greater than the maximum signal transmission between a base station and a user station twice the delay.在图2a中，某帧中的UL-MAP信息体现的是下一帧的反向信道的分配情况；而在图2b中，某帧的UL-MAP信息体现的是同帧中一段时间后的反向信道的分配情况。 In Figure 2a, a frame is a UL-MAP information is reflected in the distribution of a next reverse channel frame; whereas in Figure 2b, UL-MAP information embodied in the frame is a frame with a period of time reverse channel allocation.

图3a和图3b所示为频分双工(FDD)模式下帧控制信息和信道映射示意图。 Figures 3a and 3b is a frequency division duplex (FDD) mode of frame control information and channel map. FIG.与TDD模式类似，在FDD模式下，帧控制信息32也可由基站11在F-CCH信道中向用户站12发送，帧控制信息包括了反向信道的映射信息(UL-MAP)和前向信道(DL-MAP)的映射信息。 And a TDD mode is similar in the FDD mode, frame control information 32 can also be the base station 11 transmits to the user station 12 F-CCH channel, the frame control information comprises mapping information on the reverse channel (UL-MAP) and a forward channel (DL-mAP) mapping information.DL-MAP信息将反映下行子帧34在前向信道的分配情况，而UL-MAP信息将反映上行子帧36在反向信道的分配情况。 DL-MAP information will reflect the distribution of the downlink subframe 34 in the forward channel, and UL-MAP information 36 to reflect the allocation of the reverse channel uplink subframe.在图3a中，某帧中的UL-MAP信息将体现下一帧的反向信道的分配情况；而在图3b中，本帧的UL-MAP信息体现的是同帧中一段时间后的反向信道的分配情况。 In FIG. 3a, UL-MAP information of a frame will reflect reverse channel allocation next frame; whereas in Figure 3b, UL-MAP information embodied in the present frame is the frame with the anti-period the distribution channel.利用UL-MAP或其他下行广播信息，基站可向用户站传递指定的用于接入请求的一个或多个(子)信道的有关参数信息。 Using the UL-MAP, or other downlink broadcast information, the base station may transfer information specifying the parameters for one or more access requests (sub) channel to the subscriber station.

1.2接入(子)信道中多级回退域的分配本发明要求系统不仅向用户站通告公共接入(子)信道划分，而且需要通告对应于各个接入(子)信道的多级回退域的信息。 1.2 Access (sub) channel of the multi-level backoff domain assignment system of the present invention requires only public access advertisement (sub) channel into the subscriber station, and an access notification is required corresponding to the respective (sub) channel multilevel backoff information field.图4.1和图4.2分别为发明提出的多个接入(子)信道和对应各个接入(子)信道的多回退域的映射格式400(UL-RACH-MAP)的两种格式。 Figure 4.1 and multiple backoff domain mapping formats of a plurality of access 4.2 respectively invention provides (sub) corresponding to the respective access channel and (sub) channel 400 (UL-RACH-MAP) in two formats.UL-RACH-MAP是在UL-MAP或其他下行广播信息中描述接入信道有关参数的部分。 UL-RACH-MAP is described access channel-related parameters in a UL-MAP or other downlink broadcast information portion.UL-RACH-MAP格式400示出了N(N≥1)个反向接入(子)信道，以及对应每个反向接入(子)信道，M(M≥1)级回退域的情况。 UL-RACH-MAP format 400 shows N (N≥1) a reverse access number (sub) channel and a reverse access corresponding to each of the (sub) channel, M (M≥1) level backoff domain Happening.

在图4.2中，每个反向接入(子)信道对应的参数至少包括了反向信道标识符UpLink Channel ID，以及对应各个反向接入信道标识符的第一个回退域的起始值Backoff Value Start 1和所有回退域的结束值Backoff Value End。 In Figure 4.2, a reverse access each (sub) corresponding to the channel parameters comprise at least the initial reverse channel identifier of a first backoff domain UpLink Channel ID, and corresponding respective reverse access channel identifier value end value backoff value end backoff value Start 1 and rollback all domains.其中，标识符为1的上行(反向)接入子信道对应的参数包括上行信道标识符UpLink Channel ID 1(4202)，以及标示有M个回退域的参数。 Wherein the identifier of an uplink (reverse) access parameter corresponding to the sub-channel includes an uplink channel identifier UpLink Channel ID 1 (4202), and marked with the parameters of the M backoff domains.M个回退域的参数标示如下：从标示第一回退域的参数开始，分别为第一回退域的起始值Backoff Value Start 1(4204)和结束值Backoff Value End 1(4206)；第二回退域的起始值可由第一回退域的结束值得到，因而从第二回退域开始，仅申明回退域的结束值，即从第二回退域的结束值Backoff Value End 2(4208)直至第M回退域的结束值BackoffValue End M(4210)。 The M backoff domains parameters labeled as follows: Starting from the parameters indicated in the first backoff domain, respectively, a first backoff domain starting value Backoff Value Start 1 (4204) and the end value Backoff Value End 1 (4206); the end of the second start value of the rollback domain by the first domain is worth to rollback, thus starting from the second backoff domain, only the end of the stated value rollback domain, that is, from the end of the second backoff domain value backoff value end value BackoffValue end end 2 (4208) until the M backoff domains M (4210).UL-RACH-MAP格式400中其他N-1个接入(子)信道的参数与标识符为1的接入(子)信道的分配方式类似，例如对于编号为N的接入(子)信道，包括第N个接入(子)信道的标识符(4212)UpLink Channel ID N，和有关M个回退域的参数字段4214-4220。 Similar 400 access the N-1 other (sub) channel of UL-RACH-MAP format identifier and access parameters of a (sub) channel allocation, for example, N access number (sub) channel comprising (a) N-th access channel identifier (4212) UpLink channel ID N, and the M backoff domains related parameter field 4214-4220.

以下以回退域为两级，也即M＝2的情况为例，说明多级回退算法。 In the following two backoff domain, i.e. case of M = 2 as an example, described multilevel backoff algorithm.通过检测前向公共控制信道(F-CCH)，用户站12将得到有关反向接入(子)信道(R-ACH)和对应各个接入(子)信道的两级回退域的分配情况。 The distribution of the common control channel (F-CCH), the user station will get about 12 prior to detection by the reverse access (sub) channel (R-ACH) and a corresponding respective access (sub) channel two backoff domains .也即在UL-RACH-MAP格式400中，对应于某一接入(子)信道，定义了M＝2的两个回退域[0，β]和[β+1，γ]，其中，γ(γ＞β)和β均为正整数。 I.e., the UL-RACH-MAP format 400, access corresponding to a certain (sub) channel, defines two backoff domains M = [0, β] and [β + 1, γ] 2, wherein, γ (γ> β) and beta] are both positive integers.该接入(子)信道将提供包括快速接入和普通接入两种接入请求服务。 Access the (sub) channel provides fast access and common access includes two access request service.利用二进制指数型回退算法，可提供[0，2β]和[2β+1，2γ]两个选取范围。 The binary exponential backoff algorithm, can be provided [0,2β] and [2β + 1,2γ] two selection.当用户站需要普通接入时，用户站将在第二回退域[2β+1，2γ]中随机选取一个数作为回退时间，而当用户站需要快速接入服务，用户站将在第一回退域[0，2β]中随机选择一个数作为回退时间。 When the subscriber station needs to access general, subscriber station in the second backoff domain [2β + 1,2γ] randomly selected backoff time as a number, and when the user needs quick access service station, the first user station a backoff domain [0,2β] select a random number as the backoff time.γ值和β值的选取需要考虑到业务性能和用户数。 Select values ​​β and γ values ​​take into account the number of users and service performance.其中，β值的选取需满足快速接入业务的有关性能要求，如可接受的接入时间和碰撞率等参数。 Wherein the selected value of β to be fulfilled quickly access services on performance requirements, parameters such as access time and collision acceptable rate.γ值的选取则将考虑到普通接入业务可接受的接入时间，以及普通接入请求和快速接入请求之间的碰撞率等参数。 Γ value will be selected taking into account the common access service parameters acceptable access time, and the collision rate between fast access requests and common access requests and the like.这样从统计角度，将保证快速接入业务比普通接入业务有更短的接入服务时间。 Such statistical point of view, will ensure rapid access services have a shorter access time than the average access services.提出的分级回退算法易于扩展到M＞2的情况。 Backoff algorithm proposed classification of readily extended to M> 2 cases.对比常规的指数型回退算法，多级回退算法的优点是易于隔离不同接入类型的接入请求，减少不同接入类型的接入请求的冲突，可以在公共接入(子)信道中利用回退域的划分提供至少两级接入服务，而且对比向不同接入类型的接入请求提供不同的公共接入(子)信道的方法，采用这种方法，可以节省带宽等网络资源。 Compared to a conventional exponential backoff algorithm, the multilevel backoff algorithm advantage is the ease of isolation of the different types of access requests access, access to different types of conflicts reduce access request may be (a) a common access channel in providing at least two access services using backoff domain division, comparison and provide common access different (sub) channel access request to different types of access methods, this method saves the bandwidth and other network resources.这种方法可以方便地运用于IEEE802.16e中，以提供利用公共接入(子)信道满足硬切换所需的快速接入的要求。 This method may conveniently be used in IEEE802.16e to provide (a) using a common access channel to meet the requirements needed for a hard handover of the quick access.

3.在公共接入(子)信道中提供多级接入服务和标识切换下的网络接入请求的方法用户站通过检测UL-MAP或其他下行广播信息，可以得到诸如上行接入(子)信道和对应各个接入信道的多级回退域的有关信息。 3. The method of providing user station in a network access request and identification multilevel access service on a common access switch (sub) channel by detecting the UL-MAP, or other downlink broadcast information, such as an uplink access can be obtained (a) For multi-level information backoff domain corresponding to each channel and access channel.为了能让用户站利用公共接入(子)信道接入通信系统并得到服务，可由用户站在公共接入(子)信道向选定的基站发起接入请求。 In order to allow the subscriber station channel access communication system using a common access (a) and to services, access by a user standing on a public (sub) channel access request to the selected base station.在利用公共接入(子)信道提供多级接入服务的过程中，通信系统和用户站之间需相互协作，以便于通信系统能有效地识别用户站的接入请求并提供相应的服务。 In the process of using the public access (sub) channel providing multilevel access services in a communication system between the user station and cooperate with each other, in order to effectively identify the user station requesting access to a communication system and provide the appropriate services.以下主要以IEEE802.16e规范为例，提供在公共接入(子)信道中的多级接入服务的方法。 The following mainly IEEE802.16e specification as an example, a method in a multilevel access public access (sub) channels and services.此处多级服务包括了对切换和普通的初始接入请求的处理。 Here it includes a multi-stage process for the switching and Common initial access request.相对于普通的初始接入请求，切换下的接入请求可得到简化的网络登录服务。 With respect to the normal initial access request, the access request switch can be simplified network logon service.

3.1用户站检测下行广播信息为在公共接入(子)信道中提供多级接入服务，基站将定期或按需向与之对应的小区广播信道分配的有关信息，这可包括反向信道的分配信息(UL-MAP)，和对应接入(子)信道的多回退域的映射信息(UL-RACH-MAP)。 For information about the subscriber station detects the downlink 3.1 broadcast information to provide a multilevel access service on a common access (sub) channel, the base station periodically or on demand assigned to the corresponding cell broadcast channel, which may include a reverse channel assignment information (UL-mAP), and the corresponding access (sub) channel more back-off domain mapping information (UL-RACH-mAP).当用户站完成与基站的下行(从基站到用户站)同步后，可通过检测UL-MAP或其他下行广播信息，得到上行接入(子)信道的有关参数信息。 When the completion of the downlink user station and a base station (from the base station to the subscriber station) synchronization, by detecting the UL-MAP, or other downlink broadcast information, to obtain information about an uplink access parameter (sub) channel.

3.2用户站发起接入请求用户站可在选定的上行接入(子)信道向选定的基站发起接入请求。 3.2 subscriber station requesting the subscriber station to initiate an access channel may initiate an access request to the selected base station to the selected uplink access (child).为了让系统能在公共接入(子)信道中提供包括初始接入和切换等不同类型的接入服务，并易于与IEEE802.16a兼容，用户站将利用以上提及的多级回退算法，在选定的回退域中，计算并确定各自的回退时间。 To allow the system to provide initial access and handover includes different types of access services and easy compatibility with of IEEE802.16a, the subscriber station will use multilevel backoff algorithm in the above-mentioned public access (sub) channel, in selected backoff domain, calculate and determine their own backoff time.采用这种方法易于减少不同类型的接入请求的冲突，并提供至少两级接入服务。 This approach tends to reduce conflict in the access requests of different types, and providing at least two access service.

为了便于系统在公共接入(子)信道中识别用户站切换下的接入请求信息，从而便于为不同类型的接入请求提供不同的接入服务，以IEEE802.16e规范为例，原有的用户站的初始接入可继续利用IEEE802.16a的接入请求消息RNG-REQ；而切换下的接入请求类型的消息可以是包含有标识切换请求类型的字段的接入请求消息，或在已有的接入请求消息RNG-REQ中加入标识切换请求类型的字段，也可以利用专用的伪随机码信息等方式实现。 For ease of access in public access (sub) channel identified subscriber station handover request message, thereby facilitating access for different types of access to different service providing request to IEEE802.16e specification as an example, the original initial access subscriber station may continue to use IEEE802.16a access request message RNG-REQ; switching the type of access request message may be a handover request contains the identification of the type of the access request message fields, or has been some access request message RNG-REQ adding handover type identifier field of the request may be using a dedicated pseudo-random code information or the like manner.

3.3接入请求信息格式3.3.1 MAC层的接入请求消息切换下的接入请求类型的消息可以是包含有标识切换请求类型的字段的接入请求消息，或在已有的接入请求消息RNG-REQ中加入标识切换请求类型的字段。 The access request message the access information format 3.3 3.3.1 MAC layer requests the type of access request message may be a handover switching request contains the identification of the access request message type field, or in the conventional access request message was added RNG-REQ handover type identifier field of the request.针对IEEE802.16e的单载波或OFDM模式，切换下的接入请求可利用专用的接入请求消息。 For IEEE802.16e OFDM or single carrier mode, the access request can be switched by a dedicated access request message.如图5所示的是专用的切换下接入请求消息(RNG-REQ-HO)500的格式，在切换下的接入请求消息(RNG-REQ-HO)500的格式中，至少包括了采用的上行接入(子)信道i的标识符502和标识切换用接入类型(HO_Access_Type)504等字段。 FIG dedicated format is the handover access request message (RNG-REQ-HO) 500 shown in FIG. 5, the access format handover request message (RNG-REQ-HO) 500, at least comprising employing uplink access (sub) channel identifier 502 and the identifier i of switching access type (HO_Access_Type) 504 fields.切换下的接入请求消息中也可通过在原有的接入请求消息RNG-REQ中，加入标识切换用接入类型(HO_Access_Type)504等字段来实现。 Access request message for handover can also be in the original request by the access RNG-REQ message added with the identification switch access type (HO_Access_Type) 504 and other fields to achieve.

(1)伪随机码的生成在IEEE802.16a规范的OFDMA模式，已经定义了三种用于用户站请求网络服务的使用伪随机码的类型，分别用于初始搜索，周期搜索和带宽请求。 (1) generating a pseudo random code in the OFDMA mode IEEE802.16a standard has been defined using the pseudo-random code type for three user station requests a network service, respectively, for the initial search, a search period and the bandwidth request.这三类伪随机码均来自于同一生成多项式1+X1+X4+X7+X15，该生成式的输出构成了一个长码。 These three types of pseudo-random codes are derived from the same generating polynomial 1 + X1 + X4 + X7 + X15, the output of formula constitutes a long code.以上三种使用这些伪随机码的类型，如初始搜索，周期搜索和带宽请求等，采用的伪随机码都是从该长码中截取得到的，但生成时钟各不相同。 These use the above three types of pseudo-random code, such as the initial search, a search period and the bandwidth request, etc., are used in the pseudo-random code, taken from the long code obtained, but generates a clock varies.缺省情况下，每个伪随机码的长度是106比特。 By default, the length of each pseudo-random code is 106 bits.

为了在IEEE802.16e规范的OFDMA模式下，便于系统识别硬切换下的网络接入请求，从而简化系统处理硬切换所需的网络登录规程，可采用伪随机码的方式标识硬切换下的接入请求信息。 In order to IEEE802.16e standard OFDMA mode, the network access request to facilitate identification system hard handoff, thereby simplifying the processing system required for a hard handover network entry procedure, the access code may be employed a pseudo-random manner as a hard handoff identifier request information.为兼容IEEE802.16a，并便于系统设计，对于切换下的接入请求所需的H个伪随机码，其生成方式仍是通过对该长码进行截取而产生的，但时钟选择可与上述三种伪随机码的时钟有所不同。 For compatibility of IEEE802.16a, and facilitate the system design, an access request for the desired H pseudo-random code in the switch, which generates a manner still generated by the long code interception, but the clock may be selected with the above three species pseudorandom code clock differ.一种产生切换下接入请求所需的H个伪随机码的实施例表述如下：对应于该生成式的输出构成的长码，并对该长码进行截取。 One embodiment, the handover required access request H pseudo-random code generated expressed as follows: a long code corresponding to the formula output configuration, and the interception of the long code.其中前N个码用于初始搜索，时钟选择为0到106*N-1；其后M个码用于周期搜索，时钟选择为106*N到106*(N+M)-1；随后的L个码用于带宽请求，时钟选择为106*(N+M)到106*(N+M+L)-1；其后的H个码用于硬切换的接入请求类型，时钟选择为106*(N+M+L)到106*(N+M+L+H)-1。 Wherein the first N codes are used for the initial search, the clock select from 0 to 106 * N-1; M code used for the subsequent search periods, the clock is selected to 106 * N 106 * (N + M) -1; subsequent L bandwidth request codes for clock selection for the 106 * (N + M) to 106 * (N + M + L) -1; H codes for subsequent access request for hard handover type, selected as the clock 106 * (N + M + L) to 106 * (N + M + L + H) -1.上述实施例中的四个子集的用途也可以对调。 The use of the four subsets of the embodiments described above may be reversed.比如，前N个码用于硬切换的接入请求类型，其后M个码用于初始搜索，随后的L个码用于周期搜索，后H个码用于带宽请求。 For example, for the first N symbols hard handover access request type, followed by the M codes are used for the initial search followed by the L codes are used for the search period, the H codes for the bandwidth request.依此类推，可以有多种排列方式。 And so on, you can have a variety of arrangements.

(2)伪随机码的分配为使得系统能识别硬切换发生时的接入请求，可由系统将生成的H个伪随机码固定分配给各个小区，这H个伪随机码的生成方式见上。 (2) is assigned pseudo-random code enables the system to identify the access request of the hard handover occurs, the system generated by the H pseudo-random codes assigned to each cell is fixed, this H pseudo-random code generation method supra.在各个小区中，当某个移动站发生硬切换时，它将随机使用分配给选定的新基站所在的小区的伪随机码用于快速接入服务。 In each cell, the mobile station when a hard handover occurs, the use of pseudo-random code will be randomly assigned to the selected cell of the new base station is located for rapid access.这种分配方法简单，系统和用户站之间的交互信息少；但灵活性差，不适合用户分配不均匀的情况。 This allocation method is simple, low information interaction between the system and the subscriber station; however inflexible and unsuitable user uneven distribution.

也可以由系统按照各小区的需求将这H个伪随机码动态划分给各个小区，各个小区可定时或者按需在前向公共控制信道中，发送分配到本小区的伪随机码的标识符或其它标识信息，移动站通过检测公共控制信道，可以得到分配给选定的新基站所在的小区的伪随机码信息。 Can also use this system in accordance with the needs of the cell H pseudo-random code dynamically allocated to each cell, each cell may be timing or on demand forward common control channel, the transmission identifier assigned to the pseudo-random code of the cell or other identifying information, the mobile station by detecting the common control channel, information can be obtained pseudorandom code assigned to the selected cell of the new base station is located.这种分配方法的优点是可以适合于用户分配不均匀的情况，如系统可以向某个切换业务量大的小区多分配些伪随机码，以满足该小区的切换服务需求；缺点是需要系统定期或按需发送有关伪随机码的分配信息。 The advantage of this allocation method can be adapted to the uneven distribution of the user, such as multiple system may assign more pseudo-random codes to a large cell transfer service to meet the service requirements of the cell switch; disadvantage is the need periodic system transmitting allocation information or pseudo-random code as needed.

3.4 MAC层接入请求响应消息当正确接收到用户站的接入请求后，基站将为该接入请求分配唯一的连接标识CID。 3.4 MAC layer in response to an access request message correctly received when the access request of the subscriber station, the base station assigns the request for a unique connection identifier CID access.基站将通过握手方式完成用户站的接入处理。 The base station access processing will be completed by the user stations handshake.也即当正确接收到用户站的接入请求消息RNG-REQ或RNG-REQ-HO后，且当基站确定系统可以对该用户站发起的接入请求提供后续服务时，基站将向该用户站发出接入请求响应消息RNG-RSP，在RNG-RSP消息，将包括为此次接入请求分配的唯一的连接标识CID信息。 I.e., when the subscriber station correctly receiving the access request message RNG-REQ or the RNG-REQ-HO, the base station is determined when the system and may initiate an access request to the subscriber station to provide follow-up services, the base station will be the subscriber station the unique connection identification CID information sent in response to an access request message RNG-RSP, the RNG-RSP message, including the request for the allocation of access.

实施例在IEEE802.16e中，当硬切换发生时，可由移动站发起请求以接入选定的新基站。 IEEE802.16e embodiment, when hard handover occurs, the mobile station may initiate a request to access the selected new base station.为了兼容IEEE802.16a，移动站的接入过程可基于IEEE802.16a的网络登录过程来完成。 For compatibility with IEEE802.16a, a mobile station access procedure may be based on the IEEE802.16a network entry process to complete.与IEEE802.16a的网络登录过程相比，移动站在硬切换时的网络接入过程可简化包括时间信息，系统的有关服务能力等信息交互过程。 Compared with IEEE802.16a network logon process, the network access procedure when the mobile station switches to simplify include hard time information system about the service capability information exchange process.移动站的接入过程将包括：搜索前向控制信道，移动站取得与基站的同步并获得有关前向和反向信道分配的有关信息；移动站和选定的新基站之间协作完成移动站的接入；执行移动站的部分认证和注册步骤；重新建立会话连接和其它操作等。 The access procedure of a mobile station comprising: obtaining prior to the search channel, the mobile station information about the synchronization and obtain the forward and reverse channel assignment and the base station; between the mobile station and the new base station collaboratively selected mobile station access; performing partial authentication and registration step of the mobile station; re-establish a session connection and other operations.

1.包含切换发生时的搜索和接入过程图6a示出了本发明提出的在IEEE802.16e中，支持包含硬切换发生时的接入搜索过程，这一过程易于兼容IEEE802.16a的初始搜索和接入过程。 1. FIG comprising search and access procedure when the handover occurs 6a illustrates the present invention proposed in IEEE802.16e, the search procedure when the access support comprising a hard handover occurs, the process is readily compatible with IEEE802.16a initial search and access procedures.在t0时刻基站11将利用公共控制信道在本小区内定期或按需广播UL-MAP信息，。 At a time t0 the base station 11 will use the common control channel periodically or on-demand broadcast information UL-MAP within the cell.在t1时刻，小区内的某个用户站接收到UL-MAP信息，UL-MAP信息中包含了描述接入信道UL-RACH-MAP的有关参数，如图4所示，在当前实施例中，M＝2。 At time t1, a subscriber station within the cell receives the UL-MAP information comprising information about a UL-MAP parameters described access channel UL-RACH-MAP, as shown in FIG. 4, in the present embodiment, M = 2.该用户站将选择接入(子)信道，在t2时刻向基站在选定的接入(子)信道发起接入请求RNG-REQ或RNG-REQ-HO；假定基站在t3时刻应该收到了某用户站的接入请求消息，但由于此时来自多个用户站的接入请求信息的冲突而导致该用户站接入请求信息的丢失；该用户站在等待一段时间后若未正确接收到来自基站的针对此次接入请求的接入请求响应信号，则判决此次接入请求失败，该用户站将根据接入业务选择对应的回退域，如发生切换的用户站可选择第一回退域，普通接入请求的用户站则选择第二回退域，各用户站将通过多级回退算法计算回退时间为t4-t2。 The user will select the access station (sub) channel, originating in the selected channel access (a) to the base station at time t2 access request RNG-REQ or RNG-REQ-HO; base station is assumed to be received at a time t3 the access request message subscriber station, but this time an access request from a plurality of user stations conflict information of the subscriber station resulting in loss of information access request; the subscriber station waits a period of time if not correctly received from the base station an access request for the access request response signal, then the access request fails this decision, the subscriber station selects a corresponding backoff domain, such as the user station access service switching occurs according to a first selectable back back domain, common user station access request selecting a second backoff domain for each subscriber station is calculated backoff time t4-t2 through multiple backoff algorithm.假定用户站在t4时刻再次发起了接入请求消息RNG-REQ或RNG-REQ-HO；在t5时刻，基站正确接收到了此用户站的接入请求消息RNG-REQ或RNG-REQ-HO，基站将会为此次接入请求分配标识符，并在t6时刻发起接入响应消息(RNG-RSP)，该响应消息包含了对应该用户站的一些识别信息，包括发起响应的一些标识等；当该用户站正确接收到了基站的响应消息RNG-RSP，它将在t7时刻再次发送接入请求消息RNG-REQ或RNG-REQ-HO，这个接入请求消息将携带由基站分配的对应于该接入请求的标识符，以令基站确认该用户站已正确接收了基站发送的有关信息；当t9时刻基站接收到了用户站发来的接入请求消息RNG-REQ或RNG-REQ-HO，基站将确定用户站已经正确接收，系统将继续完成其后的步骤。 Assume that the user stand again at time t4 to initiate an access request message RNG-REQ or RNG-REQ-HO; at time t5, the base station correctly receives the access request message to this subscriber station RNG-REQ or RNG-REQ-HO, the base station the access request will be allocated for this identifier, and time t6 to initiate an access response message (RNG-RSP), the response message includes user identification information to be some of the stations, including some identification initiation response, and the like; and when the subscriber station correctly receives the RNG-RSP message in response to the base station, it transmits again an access request message RNG-REQ or RNG-REQ-HO at time t7, the access request message carried by the base station corresponding to the allocated contact the identifier of the request to make the user confirm that the base station has correctly received the information transmitted by the base station; t9, when the base station to the subscriber station receives an access request message sent to the RNG-REQ or RNG-REQ-HO, the base station determining that the user station has been correctly received, the system will continue with subsequent steps.

图6b示出了特指在IEEE802.16 OFDMA模式下，本发明提出的支持包含硬切换发生时的接入过程。 FIG 6b shows especially in the IEEE802.16 OFDMA mode supported by the present invention comprises an access procedure when a hard handoff occurs.与图6a相比，图6b主要的区别在于借助了搜索用伪随机码完成接入请求。 Compared with FIG. 6a, 6b FIG main difference is that the access request by means of a pseudo-random code search is complete.为了在公共接入(子)信道，便于系统识别硬切换类型的接入请求，从而简化硬切换发生时的网络登录规程，当切换发生时，移动站将选用专用的伪随机码在公共接入(子)信道完成接入请求，这些伪随机码的生成方式和在各小区的分配方式如前所述。 In order to access the public (sub) channel, the system identifies the type of access to facilitate hard handoff, thereby simplifying network entry procedure at the time of occurrence of hard handover, when a handover occurs, the mobile station will use special pseudo-random code in the public access (sub) channel access request is completed, the pseudo-random code generation method and the distribution in each cell as previously described.

2.接入搜索过程中用户站实施的流程图接入过程中用户站实施的流程图如图7所示。 2. Access flowchart access during the search process embodiment of the subscriber station of subscriber stations embodiment the flowchart shown in Fig.用户站通过检测公共控制信道得到基站按一定周期发来的广播消息(步骤702)，若在T1时间内用户站未收到这些广播消息(步骤704)，则表示出错，将重新开始(步骤706)。 The user station give the base station a certain period of the broadcast message sent (step 702) by detecting the common control channel, if the subscriber station the broadcast message (step 704) is not received within the time T1, then an error will be restarted (step 706 ).其中T1表示为接收该广播消息所需的最大时间。 Wherein T1 represents the maximum time required to receive the broadcast message.若在T1时间内正确接收到基站广播消息并得到了UL-RACH-MAP信息(步骤708)，用户站可利用UL-RACH-MAP信息得到分配的接入信道组的信息，用户站从接入信道组中随机选取接入(子)信道(步骤710)，并在选取的接入(子)信道中发送接入请求消息RNG-REQ或RNG-REQ-HO，其中RNG-REQ-HO的格式如图5所示(步骤712)，发送后用户站将等待基站发来的响应消息RNG-RSP(步骤714)。 If the access channel group received correctly in the base station broadcasts the message and the time T1 has been UL-RACH-MAP information (step 708), the subscriber station may utilize UL-RACH-MAP information obtained allocation information, the access from the user station channel group randomly selected access (sub) channel (step 710), and access to the selected (sub) channel sending an access request message RNG-REQ or RNG-REQ-HO, wherein the RNG-REQ-HO format 5 (step 712), the subscriber station transmits the base station will wait for a response message sent by the RNG-RSP (step 714).

若用户站等待基站响应消息RNG-RSP的时间超过了T2(步骤716)，其中T2时间表示最大的等待响应时间，用户站将继续判决重传次数是否大于设定值(步骤718)，若重传超过了设定值，则表示出错，执行错误处理(步骤720)；若步骤718判决重传次数没有大于设定值，则判决是否超过所能容忍的接入处理时间(步骤722)，若超过了所能容忍的接入处理时间，则执行错误处理(步骤720)。 If the base station waits for a user response time RNG-RSP message of more than T2 (step 716), where T2 represents the maximum time of waiting for the response time, the subscriber station continues the judgment whether the retransmission count is greater than the set value (step 718), when the weight pass exceeds the set value, it indicates an error, error processing is performed (step 720); if the number of retransmissions in step 718 the decision is not greater than the set value, the decision over whether access processing time (step 722) can be tolerated, if over the access processing time can be tolerated, an error process is performed (step 720).若在步骤722中判决没有超过业务所能容忍的处理时间，则按业务优先级别选取回退域(步骤724)，即选择对应的回退的起始和终止值，例如发生硬切换，移动站可按硬切换相应的接入优先级选择回退域。 If the processing time exceeds the judgment is no traffic can tolerate, press Select service priority level backoff domain (step 724), i.e., corresponding to the selected backoff start and end values, for example, hard handoff occurs in step 722, the mobile station hard handover can access priority corresponding selected backoff domain.执行完步骤724，用户站将从选取的回退域中按照多级回退算法选取回退值(步骤726)，并等待计算得到的回退时间(步骤728)；当等待的回退时间结束，用户站在指定的接入(子)信道再次发起RNG-REQ或RNG-REQ-HO(步骤730)，并跳转到步骤714，等待响应消息RNG-RSP。 After performing step 724, the subscriber station from the selected backoff domain according to the selected backoff algorithm for multilevel backoff value (step 726), and waits for the backoff time (step 728) calculated; when the backoff time to wait for the end of the , subscriber station designated access (sub) channel initiated again or RNG-REQ RNG-REQ-HO (step 730), and proceeds to step 714, waiting for a response message RNG-RSP.

若用户站在T2时间内收到了基站响应消息RNG-RSP，用户站将根据RNG-RSP消息调整本地参数(步骤732)，并判决用户站是否正确调整了本地参数(步骤734)；若未能正确调整，则进行错误处理(步骤740)；若步骤734判决用户站已经正确调整了本地参数，则用户站将在选取的接入(子)信道中再次发送接入请求RNG-REQ或RNG-REQ-HO(步骤736)，RNG-REQ或RNG-REQ-HO将携带由基站分配的对应于该接入请求的标识符，该信息将向基站表明用户站已经成功接收了基站发送的有关信息，此后进入下一阶段(738)。 If the subscriber station receives the base time period T2 in response RNG-RSP message, the subscriber station will adjust the local parameters (step 732) The RNG-RSP message, and decides that the user station is correctly adjusted local parameters (step 734); if not adjusted correctly, an error process is performed (step 740); if the decision step 734 the subscriber station has correctly adjusted local parameters to the subscriber station (sub) channel transmits RNG-REQ access request again or the selected access RNG- REQ-HO (step 736), RNG-REQ or RNG-REQ-HO will be carried by the corresponding base station identifier assigned to the access request, the base station indicates that the user information would station has successfully received the information transmitted by the base station , then proceed to the next stage (738).

Claims (19)

Translated from Chinese

1.一种在公共接入信道中提供多级接入服务的方法，包括步骤：无线网络系统中的基站定期或按需在前向公共控制信道中向该基站对应的小区通告以下信息：(a)公共接入(子)信道的分配信息，以及(b)在至少一个公共接入(子)信道的至少两个回退域的划分信息；在正确接收到用户站的接入请求消息，并确认能向该用户站提供对应的接入服务后，将向用户站发送接入请求响应消息，接入请求响应消息将携带系统分配给与该次接入请求对应的唯一的连接标识CID；无线网络系统中的用户站在正确接收到服务小区内通告的涉及公共接入(子)信道分配，和在至少一个公共接入(子)信道的至少两个回退域的划分信息后，若在选定的公共接入(子)信道发起接入请求，将(a)按照接入类型选择对应的回退域，并且(b)在对应的回退域中，利用回退算法计算以确定重新发起接入 1. A method for providing multilevel access services in a common access channel, comprising the steps of: a base station of a wireless network system periodically or on demand information to the first advertisement in the common control channel to the base station corresponding to a cell :( dividing information of at least two backoff domains a) access public (sub) channel assignment information, and (b) at least one common access (sub) channel; correctly received the access request message to the subscriber station, after confirmation and to provide a corresponding access service to the subscriber station, the subscriber station will send an access request response message, the access request response message carrying system assigned a unique connection identification CID corresponding to the sub-access request; the wireless network system subscriber station correctly receives the access of public (sub) channel allocation services advertised within the cell, and at least one of the at least two split information common access backoff domains (sub) channel after, if in public access selected (sub) channel access request, to (a) selecting a corresponding backoff domain according to the type of access, and (b) a corresponding backoff domain, calculated using backoff algorithm to determine reinitiate access求的时间。 Seek time.

2.按照权利要求1所述的方法，其特征在于，无线网络系统中的基站在前向公共控制信道中定期或按需通告各接入(子)信道分配信息。 2. The method according to claim 1, characterized in that the base station in a wireless network system periodically or on demand preceding announcement (a) each access channel assignment information to the common control channel.

3.按照权利要求1所述的方法，其特征在于，无线网络系统中的基站在前向公共控制信道中定期或按需通告对应其中至少一个公共接入(子)信道的至少两个回退域的划分信息。 3. The method according to claim 1, characterized in that the base station in a wireless network system, forward common control channel periodically or on demand to the advertisement corresponding to the at least two backoff wherein the at least one common access (sub) channel division information field.

4.按照权利要求1所述的方法，其特征在于，无线网络系统中的用户站在正确接收到服务小区内通告的涉及公共接入(子)信道分配，和在至少一个公共接入(子)信道的至少两个回退域的划分信息后，若发起接入请求，在对应的回退域中利用回退算法随机选择一个回退值，以确定在选定的公共接入(子)信道重新发起接入请求的时间。 4. The method according to claim 1, characterized in that the radio network system subscriber station correctly receives the access of public (sub) channel allocation services advertised within the cell, and at least one common access (in the sub ) split information after the at least two backoff domains channel, if an access request by the backoff algorithm corresponding to a randomly selected backoff domain backoff value to determine the selected common access (sub) channel time reinitiate access request.

5.按照权利要求1所述的方法，其特征在于，标识切换下的网络接入请求包括步骤：用户站在切换过程中向基站发起接入请求消息，切换下的网络接入请求消息是包含有标识切换请求类型的字段的接入请求消息；基站在正确接收到用户站的接入请求消息，并确认能向该用户站提供对应的接入服务后，将向用户站发送接入请求响应消息，接入请求响应消息将携带系统分配给与该次接入请求对应的唯一的连接标识CID。 5. The method according to claim 1, characterized in that the network access identifier of the handover request includes the steps of: a user station in a handover process initiated an access request message to a base station, the network access request message containing handover Marked handover request an access request message type field; the base station correctly receives the access request message to the subscriber station, and confirmed to provide a corresponding access service to the subscriber station, the subscriber station will send an access request response message, the access request response message carrying system assigned a unique connection identification CID corresponding to the current access request.

6.按照权利要求5所述的方法，其特征在于，所述切换下的网络接入请求消息是在原有的接入请求消息中加入标识切换请求类型的字段。 6. The method according to claim 5, wherein the network access request message of the handover access message is added to the original handover type identifier field Request.

7.按照权利要求5所述的方法，其特征在于，所述切换下的网络接入请求消息是利用专用的伪随机码信息。 7. The method according to claim 5, characterized in that the network access in the handover request message using a dedicated pseudo-random code information.

8.根据权利要求5所述的方法，其特征在于，用户站向基站发起接入请求消息，切换下的网络接入请求消息利用专用的接入请求消息RNG-REQ-HO。 8. The method as claimed in claim 5, characterized in that the user station to initiate an access request message to a base station, the access network handover request message using a dedicated access request message RNG-REQ-HO.RNG-REQ-H0至少包括了标识采用的上行接入(子)信道和标识切换用接入类型等字段。 RNG-REQ-H0 comprises using at least an uplink access identifier (sub) channel identity and access type switching fields.

9.根据权利要求5所述的方法，其特征在于，用户站向基站发起接入请求消息，切换下的网络接入请求消息是通过在原有的接入请求消息RNG-REQ中，至少加入了标识采用的上行接入(子)信道和标识切换请求类型等字段。 9. The method according to claim 5, characterized in that the user station to initiate an access request message to a base station, the network access request message is a handover by a previous access request message RNG-REQ, the addition of at least uplink access using the identifier (sub) channel identity and the switching request type fields.

10.根据权利要求5所述的方法，其特征在于，在IEEE802.16e规范中用于系统识别切换下的网络接入请求的伪随机码的生成和分配的方法，包括以下步骤：利用IEEE802.16a的OFDMA模式下的搜索码的生成式输出的长码，用于系统识别硬切换下的网络接入请求的伪随机码是通过截取该长码而产生的，最终所截取的伪随机码与其他用途的伪随机码有所不同，以便系统识别；用于系统识别硬切换下的网络接入请求的伪随机码(a)可由系统固定分配给各个小区；或者(b)也可以由系统按照各小区的需求动态划分给各个小区。 10. The method according to claim 5, wherein the method of generating and allocating pseudo-random code in the network access system recognizes a handover request for the IEEE802.16e specification, comprising the steps of: IEEE802. formula long code output from search code 16a in the OFDMA mode, a pseudo-random code in the network access request recognition system hard handoff is taken by the long code is generated, the pseudo-random code taken and final other uses pseudo-random code is different, the system to recognize; pseudo-random code used in the network access request recognition system hard handoff (a) fixed by the system assigned to each cell; or (b) can also follow the system dynamic partitioning each cell needs to each cell.

11.按照权利要求10所述的方法，其特征在于，利用IEEE802.16a的OFDMA模式下的搜索码的生成式1+X1+X4+X7+X15输出的长码，用于系统识别硬切换下的网络接入请求的伪随机码是通过截取该长码而产生的。 11. The method according to claim 10, characterized in that the search code in the OFDMA mode of using IEEE802.16a formula 1 + X1 + X4 + X7 + X15 output of the long code, the system for identifying a hard handover pseudo-random code of the network access request is taken by the long code is generated.

12.按照权利要求10所述的方法，其特征在于，生成用于系统识别切换下的网络接入请求的伪随机码，IEEE802.16a的OFDMA模式下的搜索码的生成式1+X1+X4+X7+X15将输出长码，标识用的伪随机码将通过截取该长码而产生，截取此伪随机码的时钟与在长码中截取其他用途的伪随机码的时钟有所不同，从而使最终所截取的伪随机码有所不同，以便系统识别。 12. The method according to claim 10, characterized in that, for generating a pseudo-random code in the network access system recognizes a handover request of formula search code in the OFDMA mode IEEE802.16a 1 + X1 + X4 + X7 + X15 outputs the long code identified by the pseudo-random code will be generated by truncating the long code, this clock intercepting interception pseudorandom code pseudorandom code clock other purposes different from the long code, so that that the pseudo-random code different ultimately taken to be recognized.

13.按照权利要求10所述的方法，其特征在于，所述产生切换下的接入请求所需的H个伪随机码包括步骤：H个伪随机码通过截取由OFDMA模式下的搜索码的生成式1+X1+X4+X7+X15输出的长码而产生的，由这H个伪随机码的生成时钟所构成的集合与其他用途的伪随机码的生成时钟所构成的集合没有交集。 13. The method according to claim 10, wherein the generated access request to the handover required H pseudo-random code comprises the step of: H pseudo-random code taken by the code search mode in the OFDMA formula 1 + X1 + X4 + X7 + long code X15 output is generated, a set of set of the pseudo random code to generate a clock for other purposes is generated by a clock that H pseudo-random codes constituted posed no intersection.

14.按照权利要求13所述的方法，其特征在于，对长码截取后得到以下集合：截取的前N个码为集合A，后M个码为集合B，后L个码为集合C，后H个码为集合D，用于初始搜索，周期搜索，带宽请求，和硬切换的接入请求功能的伪随机码将分别选取一个集合作为各自伪随机码的集合。 14. The method according to claim 13, characterized in that, after the collection of the resulting long code taken: the first N symbols, taken as a set A, the M code as set B, the L code is a set of C, after the code is a set of D H, the initial search, the search period, the bandwidth request, an access request for hard handover and pseudo-random code selection function respectively as a set of respective pseudo-random code set.

16.按照权利要求10所述的方法，其特征在于，用于系统识别切换下的网络接入请求的伪随机码可由系统固定分配给各个小区。 16. The method according to claim 10, characterized in that the pseudo-random code used in the network access system recognizes a handover request may be assigned to each fixed system cells.

17.按照权利要求10所述的方法，其特征在于还包括步骤：(a) 各个小区可定时或者按需在前向公共控制信道中向本小区，发送分配到向本小区的伪随机码的标识符或其它标识信息；(b) 移动站通过检测公共控制信道，得到分配给选定的新基站所在的小区的伪随机码信息。 17. The method according to claim 10, characterized by further comprising the steps of: (a) the timing of each cell may be present in the forward cell or on demand, to transmit common control channel allocated to the pseudo-random code present in the cell identifier or other identification information; (b) the mobile station by detecting the common control channel, to obtain a selected cell of the new base station where the pseudorandom code assignment information.

18.按照权利要求17所述的的方法，其特征在于，用于系统识别切换下的网络接入请求的伪随机码由系统按照各小区的需求动态划分给各个小区，各个小区可定时或者按需在前向公共控制信道中，发送分配到本小区的伪随机码的标识符或其它标识信息。 18. The method according to claim 17, characterized in that, for the network access system identification pseudorandom code switching request from the system to dynamically allocated to each cell in accordance with the needs of the cells, each cell can be timed or press required forward common control channel, the transmission identifier assigned to the pseudo random code according to a cell or other identifying information.

19.按照权利要求17所述的方法，其特征在于，用户站通过检测公共控制信道，得到分配给选定的新基站所在的小区的伪随机码信息。 19. The method according to claim 17, wherein the subscriber station by detecting the common control channel, to obtain a pseudo-random code information assigned to the selected cell of the new base station is located.